Textures Of Magnesium And Az31 Magnesium Alloy Processed By Unidirectional Rolling

In the present study, magnesium and AZ31 magnesium alloy was selected as the starting materials. The pure magnesium sheet was hot rolled at 673K. AZ31 magnesium alloy sheet was cold rolled by unidirectional synchronous rolling and unidirectional cross shear rolling. Then, the cold rolled specimens were annealed at 523K,573K,623K and 673K for 30min, respectivly. Microstructures were examined by conventional methods and microtextures were investigated by ODF and EBSD analysis. Based on the experimental results, the mechanism of formation of {0002} basal plane texture on magnesium processed by hot rolled was discussed, the evolution of deformation textures and recrysallization textures of AZ31 magnesium alloy processed by unidirectional synchronous rolling was analyzed, the evolution of deformation textures on different layers of AZ31 magnesium alloy processed by unidirectional cross shear rolled was also studied.The research results show that the dynamic recrystallization took place during hot-rolling in as-cast pure magnesium, which made the grain refinement and the uniform size of grain obtained. The hot-rolling sheet began to form {0002} basal plane texture from relative low orientation as the increase of rolling reduction gradually. The grains with the basal plane orientation had a priority to other grains to grow up at the expense of matrix grains during the dynamic recrystallization, which lead to the basal plane texture strengthened.The hot-extrusion AZ31 magnesium alloys were rolled by unidirectional synchronous rolling at room temperature. With the increase of rolling reduction, the intensity of (0117)[0772],(1126)[2021] and (1126)[0221] texture presented the trend of increasing at the beginning, then decreasing, while the intensity of (0117)[0772],(1126)[2021] and (1126)[0221] texture always exhibited the tendency of keeping increasing; which were combinational effect of basal plane slip, {1011} and {1012} pyramidal twinning and <c+a> pyramidal slide.The main texture component kept constant in AZ31 magnesium alloy cold-rolling sheet as the function of annealing temperature. However, the intensity of texture fell gradually. The full recrystallization temperature declined with the increase of cold-rolling reduction, which attributed to the higher strain energy in matrix crystal grain originated from larger rolling reduction lead to greater driving force of grain boundaries. Therefore, the recrystallization finished earlier.The texture intensity of different layers in synchronous hot-extrusion AZ31 magnesium alloy sheet was symmetric with center layer. After unidirectional cross sheer rolled at room temperature, the texture intensity of fast roller side was higher than that of slow roller side, which caused that the texture intensity of different layers in magnesium alloy was asymmetric with center layer. This was because the influence of rolling district caused by cross shear rolling.